玻壳成型过程诱导残余应力的数值预测  

Numerical Prediction of Process-Induced Residual Stresses in Glass Bulb Panel

作　　者：周华民[1] 孙强[1] 奚国栋[1] 李德群[1] 

机构地区：[1]华中科技大学塑性成形模拟及模具技术国家重点实验室,武汉430074

出　　处：《应用数学和力学》2006年第9期1047-1055,共9页Applied Mathematics and Mechanics

基　　金：国家自然科学基金资助项目(50205011)

摘　　要：建立了玻壳压制成型固化过程中残余应力预测的数值模拟模型,采用平行平板间玻璃熔体的固化问题来描述成型过程中残余应力形成的机理,并假定材料为热流变简单粘弹性材料.基于板壳理论,将产品视为平板单元的组合,并采用有限元法来求解,这种方法可以象全三维计算一样一层层地计算残余应力,非常适合复杂形状的薄压制成型产品.最后通过实验比较验证了所提出的模型和方法.A numerical simulation model for predicting residual stresses which arise during the solidification process of pressed glass bulb panel was developed. The solidification of a molten layer of glass between cooled parallel plates was used to model the mechanics of the buildup of residual stresses in the forming process. A thermorheologically simple thermoviscoelastic model was assumed for the material. The finite element method employed was based on the theory of shells as an assembly of fiat elements. This approach calculates residual stresses layer by layer like a tufty three-dimensional calculation, which is well suited for thin pressed products of complex shape. An experimental comparison is employed to verify the proposed models and methods.

关 键 词：玻壳 压制成型 残余应力 数值预测 

分 类 号：O345[理学—固体力学]